3 #![warn(clippy::from_iter_instead_of_collect)]
4 #![allow(unused_imports)]
6 use std::collections::{BTreeMap, BTreeSet, HashMap, VecDeque};
7 use std::iter::FromIterator;
11 impl FromIterator<bool> for Foo {
12 fn from_iter<T: IntoIterator<Item = bool>>(_: T) -> Self {
17 impl<'a> FromIterator<&'a bool> for Foo {
18 fn from_iter<T: IntoIterator<Item = &'a bool>>(iter: T) -> Self {
19 iter.into_iter().copied().collect::<Self>()
24 let iter_expr = std::iter::repeat(5).take(5);
25 let _ = iter_expr.collect::<Vec<_>>();
27 let _ = vec![5, 5, 5, 5].iter().enumerate().collect::<HashMap<usize, &i8>>();
29 Vec::from_iter(vec![42u32]);
31 let a = vec![0, 1, 2];
32 assert_eq!(a, (0..3).collect::<Vec<_>>());
33 assert_eq!(a, (0..3).collect::<Vec<i32>>());
35 let mut b = (0..3).collect::<VecDeque<_>>();
38 let mut b = (0..3).collect::<VecDeque<i32>>();
43 let mut b = (0..3).collect::<collections::VecDeque<i32>>();
47 let values = [(0, 'a'), (1, 'b'), (2, 'c'), (3, 'd')];
48 let bm = values.iter().cloned().collect::<BTreeMap<_, _>>();
49 let mut bar = bm.range(0..2).collect::<BTreeMap<_, _>>();
52 let mut bts = (0..3).collect::<BTreeSet<_>>();
56 let _ = (0..3).collect::<collections::BTreeSet<_>>();
57 let _ = (0..3).collect::<collections::BTreeSet<u32>>();
60 for _i in [1, 2, 3].iter().collect::<Vec<_>>() {}
61 for _i in [1, 2, 3].iter().collect::<Vec<&i32>>() {}